Improved barber and dental chair



Y i e Agtie mi. 'tanzt' YORK.

Letters Patent No. 83,644, datcd'ovembcr 3, 1868.

IMPROVED BARBER AND DENTAL The Schedule referred to in these LettersPatent and making p art of the same.

To all whom it ma/y concern:

Be it known that we, MICHAEL Lnrnncnnn and PHILIP ORON, both of the cityof Rochester, county of Monroe, and State of New York, have invented acertain new and useful Improvement in Barber and Dental Qhairs; and wedo hereby declape that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings, making partof this specication, in which- Figure 1 is asectional elevation, and yFigure 2, a bottom-view of our improved chair.

Like letters of reference `indicate corresponding parts in both figures.

Our invention consists of the arrangement, in the chair, of toggles,acted upon by a screw, for inclining the chair back and forward, `and aworm and screw for elevating the loose seat, all as hereinafterdescribed.

In the drawings, A indicates the usual stationary 'frame of the chair, Bthe adjustable back, and C theV loose seat. v

In thestationary frame, is centrallylocated a screw, D, turned by acrank, c, in the rear. On this screw, at front and rear, rest nuts orsockets b b, having toggle-arms or levers c c, which connectrespectively with the front and rear portions of the base of back B. As

these nuts receive an equal motion on the screw, it will be seenthat,'when the latter is turned, in one direction or the other, the backof the chair will be inclined forward or back.

The seat C fits loosely in the seat-frame rl, so as to be adjustedverticallyat pleasure. It has attached centrally, to the underside;aixed screw, f, resting in a turning-nut, g, which receives motion by aworm, h,

.which engages a cog-gear, i, 'on its surface. The shaft ofworm hreceives-motion by crank k. By this means, it will be seen that the seat'may be elevated or depressed at pleasure.

v This combined means of inclining the chair and rais ing the vseat isdifferent from any other with whichwe are acquainted. In most chairs,the inclination is adjusted by a foot-lever, and the parts are liable todisengagement. In ours, there can be no dificulty of this kind, sincethe nuts b b canlnever get-loose from the screw, andthe toggles o cconnect said nuts fast with the chair. The threads of the screw, whenmade of a sharp pitch, produce the necessary adjustment with but fewturns of the crank. An especial advantage of this arrangement is thatthe toggles brace the'chair, both at front and rear, and hence thestrain or leverage is not so great as where it comes upon the centre, asin other devices.

The loose seat C, with its vertical adjustment by screw f and worm h.,so ,far as we are aware, has never before been combined in a chair withan adjustable lback, although stools and chairs, in which the wholeupper part of the chair, seat and all, adjusts higher and lower, havebeen long in use. In ours, it will be noticed that the seat only adjustsup and down, while the back remains stationary, except in its forwardand backward adjustment.

What we claim as our invention, and desire tov secure by Letters Patent,isf The combined arrangement of the screw D, nuts b b, and toggles c c,for producing the backward and forward adjustment of .the chair, and theworm h, nut y, and screw f, for producing the vertical adjustment of theseat, independent of the chair, as herein set forth.

In witnesslwhereof, we have hereunto signed our names in the presence oftwo subscribing witnesses.

MICHAEL LEIDEGKER. PH. ORON.

Witnesses:

It. F. Oseoon, CHARLES Brenner.

